Notice how the "passing away" of the "generation in which we live" is not linked with death from old age but with death at Armagedon. All that remained to complete this transformation is to claim that the "generation in which we live" is what Jesus really had in mind when he used the term at Matthew 24:34.Sure enough, one month later...
And this is how they do it: subtly, one part at a time, until they've built up an entirely new doctrine without anyone noticing. That explains why the change created by introducing the "Nethinim" bothered me but didn't stay stuck in my craw. The pieces are far enough apart that you can't see the whole picture unless you're looking for it.
Some have argued that the GB is so convinced by their own flavor of "logic" that they don't realize what they're doing. But this seems too deliberate to be unconscious. It's almost malicious.